This should be done automatically in the latest version of the app (1.0.36-5) If you are using an older version you can simply login to the control panel and click 'Update' to upgrade to the latest version and renew your certificates.
We've setup a chat system on one of our AppBoxes so you can get status updates and hangout with other users and ourselves, feel free to ask anything and maybe the community will be able to provide further support.
